ADR280

ADR280 1.2 V Ultralow Power High PSRR Voltage Reference Data Sheet (Rev. C)

Document overview

• Manufacturer or author: Analog Devices, Inc.
• PDF pages: 12

Technical content

1.2 V Ultralow Power

High PSRR Voltage Reference ADR280 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2002–2007 Analog Devices, Inc. All rights reserved.

FEATURES

1.2 V precision output

Excellent line regulation: 2 ppm/V typical High power supply ripple rejection: –80 dB at 220 Hz Ultralow power supply current: 16 μA maximum Temperature coefficient: 40 ppm/°C maximum Low noise, 12.5 nV/√Hz typical Operating supply range, 2.4 V to 5.5 V Compact 3-lead SOT-23 and SC70 packages

APPLICATIONS

List GSM, GPRS, 3G mobile stations Portable battery-operated electronics Low voltage converter references Wireless devices GENERAL DESCRIPTION The ADR280 is a 1.2 V band gap core reference with excellent line regulation and power supply rejection designed specifically for applications experiencing heavy dynamic supply variations, such as data converter references in GSM, GPRS, and 3G mobile station applications. Devices such as the AD6535 that have an analog baseband IC with on-board baseband, audio codecs, voltage regulators, and battery chargers rely on the ability of the ADR280 to reject input battery voltage variations during RF power amplifier activity. In addition to mobile stations, the ADR280 is suitable for a variety of general-purpose applications. Most band gap refer- ences include internal gain for specific outputs, which simplifies the user’s design, but compromises on the cost, form factor, and flexibility. The ADR280, on the other hand, optimizes the band gap core voltage and allows users to tailor the voltage, current, or transient response by simply adding their preferred op amps. The ADR280 operates on a wide supply voltage range from 2.4 V to 5.5 V . It is available in compact 3-lead SOT-23 and SC70 packages. The device is specified over the extended indus- trial temperature range of −40°C to +85°C. PIN CONFIGURATIONS V+ 1 VOUT 2 V–3ADR280 03065-001 Figure 1. 3-Lead SOT-23 Figure 2. 3-Lead SC70 Figure 3. Line Regulation vs. Temperature

Rev. C | Page 2 of 12 TABLE OF CONTENTS

REVISION HISTORY

4/07—Rev. B to Rev. C Deleted Pin Function Descriptions Section and Pin 10/04—Rev. A to Rev. B 6/03—Rev. 0 to Rev. A 11/02—Revision 0: Initial Version

Rev. C | Page 3 of 12 SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

VIN = 2.55 V to 5.5 V , TA = 25°C, unless otherwise noted. Table 1. Parameter Symbol Conditions Min Typ1 Max Unit Temperature Coefficient TCVO 0°C < TA < 50°C 5 20 ppm/°C –40°C < TA < +85°C 10 40 ppm/°C Line Regulation ΔVOUT/ΔVIN 2.55 V < VIN < 5.5 V, no load 2 12 ppm/V Supply Current IIN 2.4 V < VIN < 5.5 V, no load 10 16 μA Ground Current IGND V– grounded, ILOAD = 10 μA 12 20 μA Input Voltage Range VIN 2.4 5.5 V Operating Temperature Range TA −40 +85 °C Nominal Load Capacitance COUT 1 μF Output Noise Voltage VN rms f = 10 Hz to 10 kHz 12.5 μV rms Voltage Noise Density eN f = 400 kHz 12.5 nV/√Hz Power Supply Ripple Rejection2 PSRR ILOAD = 10 μA −80 dB Start-Up Time tON 2 ms 1 Typical values represent average readings taken at room temperature. 2 Power supply ripple rejection measurement applies to a changing input voltage (VIN) waveform with a nominal 3.6 V baseline that drops to a 3 V value for 380 μs at a 4.6 ms repetition rate.

Rev. C | Page 4 of 12 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 2. Parameter Rating Supply Voltage 6 V Storage Temperature Range −65°C to +150°C Operating Temperature Range −40°C to +85°C Junction Temperature Range −65°C to +150°C Lead Temperature Range (Soldering, 60 Sec) 300°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL RESISTANCE θJA is specified for the worst-case conditions, that is, θJA is specified for a device soldered in circuit board for surface- mount packages. Table 3. Package Type θJA θJC Unit SOT-23 230 146 °C/W SC70 376 102 °C/W ESD CAUTION

The ADR280 provides the basic core 1.2 V band gap reference. constant 1.2 V over temperature is generated (see Figure 11). Figure 11. Simplified Architecture

1.90 BSC

0.95 BSC

Figure 22. 3-Lead Small Outline Transistor Package [SOT-23-3]

1.50 MIN

14.40 MIN

Figure 23. Tape and Reel Dimensions

0.10 MAX

0.65 BSC

0.10 COPLANARITY

Figure 24. 3-Lead Thin Shrink Small Outline Transistor Package [SC70]

Rev. C | Page 11 of 12 ORDERING GUIDE Model Temperature Range Package

Description

Option Branding Output Voltage (V) Ordering Quantity ADR280AKS-R2 −40°C to +85°C 3-Lead SC70 KS-3 RBA 1.200 250 ADR280AKS-REEL −40°C to +85°C 3-Lead SC70 KS-3 RBA 1.200 10,000 ADR280AKS-REEL7 −40°C to +85°C 3-Lead SC70 KS-3 RBA 1.200 3,000 ADR280AKSZ-R21 −40°C to +85°C 3-Lead SC70 KS-3 L25 1.200 250 ADR280AKSZ-REEL71 −40°C to +85°C 3-Lead SC70 KS-3 L25 1.200 3,000 ADR280ART-R2 −40°C to +85°C 3-Lead SOT-23 RT-3 RBA 1.200 250 ADR280ART-REEL −40°C to +85°C 3-Lead SOT-23 RT-3 RBA 1.200 10,000 ADR280ART-REEL7 −40°C to +85°C 3-Lead SOT-23 RT-3 RBA 1.200 3,000 ADR280ARTZ-R21 −40°C to +85°C 3-Lead SOT-23 RT-3 L25 1.200 250 ADR280ARTZ-REEL71 −40°C to +85°C 3-Lead SOT-23 RT-3 L25 1.200 3,000 1 Z = RoHS Compliant Part.

Rev. C | Page 12 of 12 NOTES ©2002–2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C03065-0-4/07(C)